Magazine-firearm.



J. D. PEDERSEN.

MAGAZINE FIREARM.

APPL-ICATION FILED IUNE 5| l9l6- RENEWED AUG- 9' I9".

1,317,988. Patented Oct. 7,1919.

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I. D. PEDERSEN.

MAGAZINE FIREARM. APPLICATION FILED mu: 0. ms. RENEWED AUG. 9. um.

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MAGAZINE FIREARM.

m canon FILED mus 0.19m. nzuswso nus. 9.11m.

Patented Oct 7,1919.

H SHEETS-SHEET 4.

Jnbenior:

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I. D. PEDEBSEN.

Patented Oct. 7, 1919.

H SHEETS-SHEET 5.

'l'l-II COLUMBIA WRAP" CU., WASHINGTON, D. C.

J. u. PEBERSEN.

MAGAZINE FlflEARM. APPLICATION FILED JUNE 8.

Hi6. RENEWED AUG- 9.19".

Patented Oct 7, 1919. 6 l4 SHEETS-SHEET 6.

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1. D. PEDERSEN. MAGAZINE FIREARM. arrucmou FILED was 6. mo. ncnzwso nun. 9, 1911.

I. D. PEDERSEN.

V MAGAZINE FIREARM. APPLIQAI'IOII race was a. ma. acumen we. 0; m1.

1,317,988. Patented Oct. 7,1919.

14 SHEETS-SHEET l0- fnvenior: Jb/zn fi-z ewnsen.

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Patented 00t- 7,1919.

14 SHEETS-SHEET n.

John 3 Pederaerg,

Nw MQM- L D.PEDRSEN. MAGAZINE HREABM.

MPLICATIOII FILED JUNE 6. ISIS. RENEWED AUG. 9.19"-

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i. D. PEDEBSiN.

MAGAZINE FHIEARM. Arrucmou mm mm: a. mi. Insulin us. 9, m2. 1,317,988, Patented Oct. 7,1919.

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1. n. PEDEBSEN. MAGAZINE FIREARM.

AFPLICATIMI FILE!) NINE 6,15|6 RENEWED MIG; 9| l9".

Patenwd Oct. 7,1919.

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ei-eto an atuatof bf meens in position and arranged for actuating the carrier in some speoifieii fiiaiifiif 'oi thfiingg and, for illustration, it may be netegl that appurtenant th in one such instance there is a fGIWBZId located ectu p r appurtenant t0 the baseand" $11 hnd arr aiiged for!" brokenfe yrfiw em e fl n'er 1B:

'shewn in a preferred tw aqnenehefi ior m;

thereot, but only a few; ei-the detauls ofi meehanismfnreishp llfl i ml fi fi r Fig. 3 a side wiew simi lerte l;

but ith th sight-bese ece ver e mm may f r llustseti g sn steinieetures-off-tlie meehenism chamber withi the repe vetg Fig. 4; iarsieleai iew u 7 ngin to 1 an; in pfitt l-E g f' f fit i illustrating the pretense take-flown" struction shown in Figs. 1 3, Wherehy the "i -en m l? er lunk" ixeleeemem el'r A in a non-firing position.

mas besense i y nd efim m y seemed inn i'ele'asable manner to=tee g uerd er Peer -r ward heme-member 3, :1? is enentl View of the gnard frame Zine-s en hem-the rigl han i e i n-fig- 5 e e t e se e ei ee ne Figs. land 3; in this View ,mem': here are brokenemay grshewn in seetion in a eonttentional manner, in! ,-mere iullg deeds shewing. he meeh mine ee riegend certain ofithe-gletails vgheh eree'eoo iemtiye has were QsQP m 7 z g -r f 15* e a i 5 e1 pertien of fig 5, for funthe 'iilustratil g themode ei zepefation of eentain pletails qfthe m w es r eeh niee 17 i views, Figs. ,fi end 5" include alside View of th slide leek 22,-which isthu s shown in two sneeessiee pgs itions, nespectivelgyfwhile 5 flii-ther illustrates some iea turesfof a preferred means fur; retracting and RIB-'- liminarily loekingflie hemmer, temporamlgng Fig. 55 is e seetien azl viewtekenenthe line X, of Fig.1 5,- for shqwingeertein 9f the features and details which-ere heatedat the lett-hend'ef, Said line es-seemtrom e point at the right-hand j thereof; this view the head portion of the breech-bolt, 7, is shown by dotted lines in firing pesition.

h i; a si e 9191136611 siihilai t6 Fig.

Fig. 7 5 for illustrating the positions of the princi- 1591 piifiss when the slide, 6, of the bnfigfh action has been retracted to a 'po Iit in-e the rotetive disengaging movement of the breech-bolt has been completed en the further rearward: meflanint eeidielel e n b k l l wwe y 1n unlson t erewith.

Fig. 6 is a cross-sectional View aniline X9, Qt Egg-see w il iestret sthe position f t e 7 relatjageiy ee Be sw msee seid o ti tat t the 1 .g' e a ginlFig. 6,.where the me eiwi we is west e 20-),

rom the barrel, 1. =rdiiig n flew-similar to :Fig; 6, but m ea ed t the se fieienemsletelw th m mg= the 11 1 mmzthe .hei 7 erein en: t emmes t;e@ t en th me e e e lso Fig 2,1) ee A. as; eeaeet e ttlmE sentienal View in LineXW, Fig.

R P to a -91 i ile tmt e s e ee i ien oi the riegg ergms; ,g-shgu lliin 557, i 7b i 7. E h etmeenthe genie-1', the extmetor and theextracted shell at the time when=the retion ofi BifiCtjJlgJhfi-Sllfikl isebout tabeis; side-rviewwop elevation similar teseg-swhet' sh m ng,- e breeehi a t end ihe eenrier'in its loweron; L l dge; position, which s it een; ie efi -Fu efitiee e l lgle X 3 Fig. 8,319.91 e est mseeefig eel weewh e f g; 8? is acrossfi fessewe i e e w Q th egt rnt neege hr iagzvay mnd llustrates e1 pos tigngef flannel-siting parts when the egtion hes beens eniewhat adveneed t em, itewostreenwrfl pfj ition, and the cafiier hes just been elevated to the loadingin W {i g a; .1 and 9 v a lug setes e @me e ad ance peslt o Qflbhe linqtion in which theh-reeoh-bolt tenses ,etssseiwoit thefifing nieeh rineipal' operati ve s 1s thereof erre gej shove a serene portion of the guard fr' "e 3 Fig. 11 is a detail view/"farther illustrating theoperation of the hammer-aotuator end the slide-look;

Figs; 12, 43 31161 -13 ere, respectively, a plan; side elevation and end elevation 'of' the base-member or slideg fi of the breech ac tiongthese views are drswn in alinenient, or 'proieotion; e eonventiorra l manner to facilitate comparison: 7 I ifiiga itiiv is az cross se'otion r he 6*taken on line X I of Figs 13 and 13? is a side View of fithe reisoyahle slide guide shown inseotiori'in' Figsfi. 1 Fig. 14 is a longitedin al vertical seotio of the slide BQtaken on the line' fi of Fig. 12 this view, Fig.':14,onlyshowsthat portionof said slide whieh is aboye-the line X 5111 Fig. A f; l J

Fig.2 i5 is ai di-age'atie jragniem tary sidewiewshowin fzti ecarrier bfy'fsolid lines in thei ositiomt ereof shown in Fig. 5; and laydotted lines-inthe position thereof shown in Fig, "s 'while theslifieoisindicated by solid and dotted lines respetively, in its-extreme forward' and: rearwarclpositions relatively to the carrier these carrier and slide'pesitionsnlso correspond to Figs.

22 and=118 respectively. 1

' Fig. 16 is a plan viswzofathe preferred arrangement I of a. two araieoarrier in which the arms are physioall unoonneetedi though operable as a single: eviee, and Fig. 1'? is a side View .of onezarm or half-portion of such. carrier; these tworiews are drawn in alinement, and in Fi 17, aawitlidrawn shell is indieatedz by :dott lines in 'a relative p0- ej'eeting operation; which is further illustrated in FigVZQ. T

:ri ssi s was aimmaingkrigsiss s9");

are a; ezf :seuem'riews i supplemental to 2155216 audit; sire speeiailly arranged for illnstrating the prineipal suscessive Positions and functions of the carrier-member. .8,.operating 'both'es a eartridge-elevaton and as a shell-ejectoi gewith relation to such. Carrier-actuating means 1 and other i" of the fire arm meehanism as most chreotly cooperate therewith during the successive stages, respeetiveiy, ofiihe com; plete nycle' of. opes-ations oi? thes 7 seven views; Fig; il is sai seetiomaieview 5 on 3 line X of Rig.v 1'9, and Fig.:;1-9?i is i a. similar view on li neXli of 1 Figsi23 toi26= (including Fig si 24 25 are a seriw of eightoietaiil and fragmentary views ior iilustratihg (certain features, of? the construetion iand mode of operation of a preferrecl form and management of'breeohbolt, firing-pin and extraetor which are comprisedizn the particular i'orm "of breech aetionfwhich I have seleetedns being convenids 1 Fi sition readyifor the beginning of theshell nessissble for assisting 1 in the illustra'- erein of the improvementswhieh con stitnts thESiIhject-nmtter of his present ap plication,

jFi gs. @7527, 28 and 28}are detail views showing on a somewhat enlarged seale, some of the'operable'parts of the adjarent ViewsFigs. 6 and 6.

Figs. 29 to 31", are a series of nine views further illustrating the magazine mechanisinggand the means 'comprised in or appurtenantte the same, for detaining and releasing the' oafitridgesi in this series'of views, Figf29 is across-sectional View about onthe iineX OfFig S Fig. 29 is a fragmentary longitudinal section (corresponding to a portion of Fi 8) takenlon the line X of Fig. 29;, an I showing parts at the left-hand of said line; Fig. 29 is a oompanion View to Fig. i295 being taken on said line X and showing. parts at the right-hand of saicl line as seen from the lefthand thereof; Figs. 30 and 3L- are ivievvs similar is i Fig. 29, and illustrate difl'erent positions of certain. of. the operas tive eletails,- which positions are further shown in Figs. 29, 30" and 31"; and, F ig. 3l' is a view. similar to Fig, 29 and is supplemental to'Fig. 31 for indicating an in termediate stage in the delivery of .a cartridge from the magazine tube, 5, onto the carrier S -this operation being shown completed in Fig. '8. e

: =F gsa-3flto32 yare a series of five diagrams for further illustrating certain of the cooperative relations and movements as be tween'the ioombined carrier and ejector '8, the breech-bolt 7 and the magazine and bar'- rel, a hereifnafter more fully explained. Fig. 33 is a diagram illustrative of oertainof? the operational features; which are represented infthe series of riews, Figs. 3210 32, inclusive.

5.3% isva companion View of,- and is drawn ins ali-neuieet with Fig. 1 32*, l and is arranged ifor illustrating .a% variationand. supplemental feature which sometimes may beemployed, but which is not fully shown in theseries of views,Figs. 32 to 33, inelusive. r o L r Fig-.339. is a diagram similar to 33, exeept that itis arranged for illustrating the variation and supplemental feature indicated in Fig; 33", as hereinaftermore fully QKPI HQ E-a =5 i" 1.2 a

' @34 anda35 are, respeotiw rs a :p and a-Bide VlfiW, and correspond .suhstantiallywith Figs. 16 and 17, except that the tWo-armearrier is here shown with the two side-parts, or side arms, thereogtaoonnected tpgether -r-preferably in a rigid manner and also integrally afor simultaneous operation Figs 3-5; is a: fragmentary seetional view on line X""E,-;Fig. 35, and corresponds with .835 and 13; this view,; ]5 ig. 35?, is

nem n inieliee eent with: i3 135 iilles: treteegmle nnect ee thex wlfi pena -1.1}; fee: mazes f the cea t n s. b twe n; the 11566611 action and carrier.

Eig q afiendfi ere views s miierie e mgementend p rpose to 15515, shaving: the carrier whee thifi member is constructed in thesingle-Mmiorn enfi arrangement; Figs. 36 andBfi? are. er sesectional views showing theme-arm carrier intwediflenent positions, esit wonldappeer when seenflfsgom the right-handizr Rigs-i as end-3 5, respectively; of these four views it wiB be that Figfe'vt'ii corresponds with the view 19 jilystretig thetwemrm form ,of'the carrier, iWhHB Fig similarly corresponds with Fig; 7i

Fig.3? is a diagreznen'angedes elcresssectional viewin abeut the iiee- X Fig. t1, fon illustrating the various relatinnmbiistingot :snoeessive stages in=;the opereation, or cycle of'movement, as between theearrier end the shell of a. cartridge.

381;;38Hand 38*,ere ezseries oai' diegealnsillnstreting a feature of o seraitign of one pe'rt (tithe preferred oerriereetmtizl g: means herein selected forillustrafion; where by the earriermay be operetedrfromithefl loeding in peeitionthereof toward. theashellreeeivin'g positioh thereof, by en eeeelemtedi movement end during the later stage the forward movenient of the base-member of the reci rocatable breech action. Fig. 9 "'s a diagram further illustrative of certain featares of construction and of operation of the eerrier as shown inFig; 16-;

this diagram, Fig-39, is also sl pplemientel to 18 to -22 'in eh sivei imilar eharaeters designate like parts m all the views.

The principal members of the fireemi' mechanism" are indicated in the V drawings by the following eheraoters, viz'rthe Bee-61,,

1"; the receiier," or 'ferward freme 'rnemher,

1 by 2; the 'guard freme ext-"rearward framemem tr e es o i qm e zine, byte-the base-member, or=sl1d"of:

the breech-action, by 6; the breeebbolt, by

7 the barrier, which in this instance, is a combined carrier and ejector, by 8 the e xtreotor 'by Qjihe bolt stop, i ee tlon ber lsiteh; by 1 9 the cartridge-stop, at the mageziije By 11; theme e ning faliewer,

1 2; the megsizine spring, 3% 13;=the hem- E lnegby the sear, by 15; the safety-sear,

by 16; the fii'ing pin by 1 7; the toek, by

e atent, by 19; the hem a q take-down S i f y 5 $110 y 22 the maie-spfieg hy 33711193343 of my presel t improvements;

sides so" that the rig-behind: endle fteliiiiidesifiee, as also the iipper side, may

meme

e unp rfiem adzbenwmmeee wh eh wel peeet tztb lee eem eithe ev e e1 eb ek filzeer QifixgBJ-TBMQQSEQ m soew neimegeatepan w their 1, retieerkEohmetmge-ueh miii fiefi memeeeeeeene maimed mlfiilliecqliabit'utes; part the Sub ect-metter of a aepagefi appl eationto abeieopeudeug with 'Ehisetttomember frsi nesmn atgietmniesmegaeds eee tam featureeitheeeeeEfleixEnamre at a: itekezdomi .cleeiee mkeeehy 10' open. that mohianasmelahmbx hias ueh ememner este feozhtateathe eminlhngthieneififimd thesefrom otiheiwodsmg At feather feetme henlrr eliew n, :liet' also to the com p t fi gl 1:} the smeet-mitten oifeeid separate; appllcetion, IS the reinbvebliy mounfimg; the isliding bnse rhember, es :fi, of a action whieh is reiprocalsehle in the recewer. l V

V The eonstimetion the twoepart ifl'flJHGjand the. arrangement ief fiee breeeh aetion slide Smith the, tworemevehle guides 653 CFigs 18?, 131, providesieihoiigmther advantagemen. 'nie meelis-fofillngiifii tHeretmetionof thehxieeehgedtinir by V min-e ,g egeinere-t ate stopface', ae fi ot thexslie fi with an abutment-face, as 29; (Rigs. 83);, of the :Eorward or tieeeiver. 2.1 when' the peertw'erd ffernewmemhen, m:- ygfiardi-il'tmme 3; 1S'12( 3II1Yfi d:1he"S}id 5, filienmetvactefl, pI3 1}eot far enough ummy of; the 12eeeriler Q; zfdr tosenit zthe meme of gui e-retainng inifii 'algig. 8 wheneu the V $963 5: mey e 'mithdeewn r53: was: Ly fromihetwm the' siidh blookwfi and. the reeeiveiwwalls; asfteriivhiizh the slide itseil may-he lowefied-emlith us tekzen out oi the receiver..- Eytkisgorganizefiion of said members, a, fixed; eblitm gt, maybe provided pent oifstheieceiver, and maybe {81 ,giitetlydia the line of moiffimenfi (if siii stop-face 6 while ptovidiiig' e oenl'venientlmetlfod. a t assembling and itflkiiig' fi&wiiih meehmismr Said guides; '6, i6; fitai'n tlteiguidiewahys. 2", 2*, respectively, 0;? the eeeieer; and use preferabliy a itxingueealmdgroove construotion,-with zthe slide, 7 l( Fig. 13'), and thus form, ineifeet is regards operation, 5) component part-of "the sliding base-member of the breech action. This construction provides great strength, and also for a free sliding movement of the basemember in the frame, while the projecting ribs or guides 6, 6*" engage in the respective channel-form guideways of the frame.

The reciprocatable breech action is herein shown as comprising a slidable base-member, as 6, (which in practice may have any suitable form and proportions), and a rotatable bolt-member, as 7 which operates in combinations that include the extractor and firing-pin, together with the several details and features thereof; these improvements, however, are not specificall claimed herein; but will constitute in part t e subject-matter of a separate application to be copending herewith.

The usual action bar, as 20, may be conveniently coupled to the slide 6 by means of the rib 20 formed on the action bar and engaged into a suitable slot in the slide 6. An ordinary hand piece or operating handle,not shown,-may be fastened to the action bar 20 forwardly of the receiver, in a well-known manner, for the purpose of operating the breech action. In the principal views, the action-bar 20 is shown located on the left-hand side of the firearm, butit may be arranged on the right-hand side, as indicated in Fig. 36*.

For the purpose of simplifying in the accompanying drawings the illustration of my present improvements, only one form and arrangement of the reciprocatable breech action is shown therein.

This preferred form of breech action has the base-member, as 6, arranged for a sliding movement, and in now describing the construction and arrangement of the details of the firearm, said member 6 will be sometimes referred to, for convenience, as a slide, or as the slide, or as being slidable, as the case may require. In some instances, however, such a slide or base-member may be of a curvilinear form, and may be so arranged as to have a pivotal support, and thus have an oscillating forward and rearward alternate or reciprocating movement, (not herein shown), within the purview of my invention and as re ards some of the combinations herein defined.

For actuating the firing-pin by a suitable blow thereon, I have illustrated in the drawings an improved hammer-sear-trigger mechanism which is not specifically claimed herein, but which will constitute in part the subject-matter of a separate application to be copending herewith. In practice, other kinds and forms of mechanismjmay be employed for effecting the firing of the charge, in connection with the breech action and carrier combinations which are defined'in the claims of this present applieati'en, or

herein set forth. In the preferred arrangement of such a hammer-mechanism selected for illustration herein, the hammer, as 14, is pivotally supported in the frame of the firearm, and is provided with coacting devices which will be understood from the references made thereto in the course of the following description of the firearm-mechanism and of the mode of operation thereof.

Since the cartridge shell is ejected or expelled downwardly past the rearward end of the magazine, the entrance from the magazine to the mechanism-chamber in the interior of the receiver should be guarded by some suitable detainer means whereby the cartridges may be releasably held in the magazine. In the drawings a preferred kind and form of such a detainer device is shown, but as regards a proper co-action with the breech action and carrier, the detainer device or means may have any suitable construction. The particular kind and form of said devices which are herein illustrated, are not specifically claimed herein, but are regarded as embodying a separate invention, and therefore will constitute in part the subject-matter of a separate application to be copending with this present application.

The mechanism chamber incloses a combined loading, firing and shell-ejector mechanism which comprises carrier-actuating means, and also comprises, as one member or device thereof, a carrier which is operable transverscly of the barrel, to and from three positions, viz., one terminal. position (Fig. 8) for receiving (011 the side thereof toward the barrel) a cartridge from the magazine, a second terminal. position (Figs. 5, 6) for receiving (on the side thereof toward the ma azine) a shell from the barrel, and a third and intermediate position (Fig. 9) for holding a cartridge in loading position. Said combined mechanism also comprises a breech action which is operablysupported in said chamber for a retraction stroke from a firing position, (Fig. 5) and is arranged for actuating (on the full retraction thereof), the said carrier to its said first or cartridge-receiving position, and is also arranged for actuating (on a forward stroke thereof to firing position) the said carrier to its said second or shell-receiving position.

On the front. endthereof, the mechanism chamber within the receiver, is in communication with the barrel, 1, and with the magazine, 5, which are thus in a position forward of the receiver and the said chamber thereof; and, the barrel and magazine are so arranged that the magazine entrance,see Fig. 5, is 'on a line, or at an elevation, between the barrel-chamber and the ejection opening 2 This arran elnent rovides for the carrier, or the cartridge receiving end therect, a 8",

havii one terminal stroke position in a cartri gel-receiving position which is relatively between the magazine entrance, and the ejection-opening at 2; sue a position of one form of such a carrier is shown in Figs. 8 and 18. This arrangement also pro vides for the carrier to have a working stroke from said cartridge-receiving position (Fig. 8) to a shell-receiving position (Figs. (3, 7 and 21) in which the ei irrier e d, 8", is on the opposite side of the barrel ontrane from the said ejection opening. 7 o In ig. 5, it ,Will be noted that the carrier 8 lies in its l pper position, so that the certridge shelh-in heinf extracted tron the barrel-chamber, can, be rav'vn hack tinder the carrier, Whenthe carrier is piyo'ted near the rearw rd end thereof in the rec iver, as at 8*, am is then elevated to the loll-re ceivingposition (see Figs. 5, 6, 7, 17, 20, 21, 32, 32?.) it may be yieldingly held in that npwarc or normal position by some suitable detent at 19. For this deriee, I hare shown a well-known kind of spring-actuated slidable plug, as 1Q? (Fig. 6) of tubular form, comb ned with an actuating spring 19", said plug being contained in a hole formed in the frame and bearing against a cam-face as 8=, of the carrier, as clear y indicated in, ant by the drawings.

he tw,o part framework, in the preferred form and arrangement thereotherein illustrated, may be separably connected by interockingmeans which are appurtenant there- 0, and are used in combination with some suitable locking device. Onearrange nent of such means and device is indicated in, and will now be described in connection with Figs. 3,4 and 4. For holding the receiver, 2, 1n roper alinement with and in position latera ,ly of the guard-frame 3, the receiver is shown provided with ribs 2?, 2",wvl1ich closely engage in corresponding grooves, 3, 3, formed 111 said membe'rB. Atits forward end (Figs. 3, 4) the n enib er 3 has projections, 3 3 wliicl'i closely engage in recesses, 2", 2 (Figs. 3, fiend-thus prevents any Separ 'tion ct theiorwerd end of the freine 3 iron thereceifier 2, I Yh G D the two said pnrtsare esseinbled togetherfas in Fig. At this time, the nut 'portid1i3 (Figs. 4, 11) rests within a recess, in the member 2, while thecnppedfliead s'ci eimfi has the head i'iin2l tiereof eiig ging in an annular groove, 2, ig. .1 1), whereby said rim also engages forwardly of the receiverri' n 2 ',,a nd rearwerdlyio-f the frame-rim 3 Tlnis thescrew-head l serves; as a clamp device which engages (by, means of said rinis) with both receiver an gilard-fraine, and thereby firirily connects these members. B ge t lnw thdm ng h r *1 .n 21 ige, the reee'Xer, 2 may e slid lorwardly (as there e own) on the Traiiie .1,

whereupon the frame 3 may be lowered and removed, together with the lnunmcr-mech- :ui'i sin (Figs, 11, 11") whieh,' in the pres-- ent instanee,is shown assembled thereon. In Figs. 3, 4, 4, I have designated a usual Llornr of trigger-guard by 3"; in practice this guard may, preferably, as indicated n the drawings, be made integral with the main )ortion of the guard-frame 3. Also, I have here indicated at 3, the position of a usual form of trigger-stop which, for convenience of illustration, is not repeated in all the fignres in Whichthe nehiber' 3 s shown; sue e trigger-lock being a en. kncw deyme, and one which need not be us ed n ell eases, therefore it need not be more hilly described.

Thebrecch action is rctraetably supported in the frame and, Whenproperly equipped, constitntes a loading mcehanlsni. In the arrange n'ient thereof herein illiistrated, the base-member of the breech action has a sliding form, as 6. In practice, this slidable member is preferably prowided with a breeehing-niember no! of the usual block kind or form, but with one havingthe form a rotatable boltl. Forthis purpose the e-niember 6 is herein shown provided with the npivardly projehting bearing, 6%, in which a centra l bore, 6 F1 g' 13, is nialde for receivin the tubular stein, T1, of the bolt head 7. he, eai'i ig .6. stem 7 are shown provide with ineans whereby to impart to the stenrerotatory in'ovefiient when the stem is moved either f mm diy er rear: wardly in said bearing. One snitahle inciins for these piirpos'es consists of coactinghcliribs and grooves, as ribs '(P, 7 f, on the stem, and grooves 6, 6, ir the said bearing 6 ,,wherehy the movement imparted to the bolt 7 relatively to said bearing is of a ielical character. These movements, however, occur only duringa longitudinal movement of the member relatively to the receiver and, While the bolt has only a rotatable more, inent relativeiy to the receiver; e leziitlin pn ,pose Of thlS erren geinent is tp l oc'k an unlock the bolt-head to,,and from receiver, Qth 6positions being indicated in F an lespeetivelp, v M

n Fig. .6? thel 'kirigflngs 17?, 7?, on'the breech-bolt are shown, rotated 'ont of engage rneiitwit h the locking shonlders Qflqnthe receive the to lusg 7?" is inpofijtgdht of sli enter the slot 2", (Fig. 1), formed the top of the receiver. The nnlocking"retpltion of thebreeeh-bolt. is limited by the side 7" of the lu'g 7f strikin against the side tarot of the rib 2 in t e receiver,-Figs. 6 and 5,, ithe breech-bolt at its front end also car es? ll eiz rb ei n, which Pa s th ees}; hespe ne i s h unlo ns rem o he. hilt fe d t e ei 'pil tion of this unlocking rotation, the 

